:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --surface2: #243044;
  --text: #e8eef4;
  --muted: #8b9cb3;
  --accent: #5b9fd4;
  --accent-dim: #3d7ab0;
  --danger: #d45b5b;
  --border: #2a3548;
  --orange: #e07b2e;
  --orange-dim: #c46824;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--text);
}

.btn {
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text);
  border-radius: 8px;
  padding: 0.55rem 1rem;
  font-size: 0.95rem;
  cursor: pointer;
}

.btn:hover {
  border-color: var(--accent);
}

.btn.primary {
  background: var(--accent);
  border-color: var(--accent-dim);
  color: #fff;
  font-weight: 600;
}

.btn.primary:hover {
  background: var(--accent-dim);
}

.hub {
  max-width: 960px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 3rem;
}

.hub-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.hub-header h1 {
  margin: 0 0 0.4rem;
  font-size: 2rem;
  letter-spacing: 0.02em;
}

.hub-sub {
  margin: 0;
  color: var(--muted);
}

.hub-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.hub-cards-3 {
  grid-template-columns: repeat(3, 1fr);
}

.hub-cards-4 {
  grid-template-columns: repeat(2, 1fr);
}

.hub-cards-5 {
  grid-template-columns: repeat(2, 1fr);
}

@media (min-width: 960px) {
  .hub-cards-4 {
    grid-template-columns: repeat(4, 1fr);
  }

  .hub-cards-5 {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1200px) {
  .hub-cards-5 {
    grid-template-columns: repeat(5, 1fr);
  }
}

@media (max-width: 800px) {
  .hub-cards-3,
  .hub-cards-4,
  .hub-cards-5 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .hub-cards {
    grid-template-columns: 1fr;
  }
}

.hub-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.5rem 1.25rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.hub-card h2 {
  margin: 0.25rem 0 0;
  font-size: 1.2rem;
}

.hub-card p {
  margin: 0 0 0.75rem;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.4;
  flex: 1;
}

.hub-card-icon {
  width: 56px;
  height: 56px;
  border-radius: 12px;
}

.hub-card-icon-server {
  background: linear-gradient(135deg, #3d7ab0, #5b9fd4);
}

.hub-card-icon-video {
  background: linear-gradient(135deg, var(--orange-dim), var(--orange));
}

.hub-card-icon-chess {
  background: linear-gradient(135deg, #2f6b4f, #6fcf97);
}

.hub-card-icon-pr {
  background: linear-gradient(135deg, #8a5a2b, #d4a15b);
}

.hub-card-icon-drsallay {
  background: linear-gradient(135deg, #5a3d8a, #9b7bd4);
}

.hub-card-btn {
  width: 100%;
  max-width: 180px;
}

.auth-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(8, 12, 18, 0.82);
  padding: 1rem;
}

.auth-overlay[hidden] {
  display: none;
}

.auth-card {
  position: relative;
  width: 100%;
  max-width: 340px;
  padding: 1.75rem 1.5rem 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
}

.auth-close {
  position: absolute;
  top: 0.5rem;
  right: 0.65rem;
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  padding: 0.25rem;
}

.auth-close:hover {
  color: var(--text);
}

.auth-card h2 {
  margin: 0 0 0.35rem;
  font-size: 1.35rem;
  text-align: center;
}

.auth-sub {
  margin: 0 0 1.25rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}

.auth-label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.auth-input {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
  margin-bottom: 0.75rem;
}

.auth-input:focus {
  outline: none;
  border-color: var(--accent);
}

.auth-error {
  margin: 0 0 0.75rem;
  color: var(--danger);
  font-size: 0.9rem;
  text-align: center;
}

.auth-submit {
  width: 100%;
}